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Hydraulics > Notecards > Flashcards

Notecards Flashcards

1
Q

Any force, which can stop or retard the movement of a body

A

Resistance

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2
Q

Energy can neither be created nor destroyed, although it may change from one form to another

A

Law of conservation of energy

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3
Q

An important consideration when dealing with energy is

A

The state or condition in which it is found

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4
Q

The application of a force to cause movement of an object through a distance

A

Work

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5
Q

How does a positive displacement pump work?

A

As the piston is pulled out and increasing volume is formed within the housing, the body and portal food to entered, filling the void. The plunger pushes in the ball at the in wet port closes. The food is pushed out while the ball at the outlet port is opened.

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6
Q

The volume of fluid flowing through tubing in a period of time is

A

Rate of flow

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7
Q

The generation of heat by working energy traveling through a system to a point of work

A

System in efficiency

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8
Q

A common food for a hydraulic system consist of

A

Paraffinic and naphthalenic petroleum oils

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9
Q

Besides acting as a medium for energy transmission the second most important function of a petroleum base fluid is

A

To act as a lubricant

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10
Q

The process of reducing friction between relatively moving surfaces, which are in contact is

A

Lubrication

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11
Q

The resistance of a liquid molecules to flow or slide past each other

A

Viscosity

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12
Q

Say Bo universal second is abbreviated as

A

SUS or SSU

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13
Q

American Society for testing materials is abbreviated as

A

ASTM

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14
Q

As high-temperature oxidation at pump outlet occurs resonance materials are formed, but dissolve in the oil when a hot surface is encountered

A

The resins come out of a solution for a varnish coding, the hot surface this causes moving parts to stick

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15
Q

Other than varnish, resonance materials can also form

A

Sledge which combines with dirt and floats around in the system plugging small openings

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16
Q

Dirt and a hydraulic fluid can

A

Plug, sensing orifices, causing moving parts to stick in where excessively

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17
Q

A high-pressure line with a pinhole leak, spraying and oil mist into the air is

A

A combustible mixture, which can be easily ignited by an open flame

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18
Q

Synthetic fire, resistant materials are man-made liquids, which are

A

Praised for their resistance to burning while performing close to petroleum oil with respect to lubrication

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19
Q

Atmospheric pressure at sea level standard conditions of 68°F and 36% relative humidity is

A

14.7 PSIA

20
Q

To differentiate between two precious scales what does PSIG and PSIA stand for

A

PSIG denotes gauge pressure and PSIA denotes absolute pressure which is 14.7+ gauge pressure

21
Q

Cavitation is the formation in collapse of gassiest cavities in a liquid. The two ways they are harmful are.

A

They interfere with lubrication and destroy metal surfaces

22
Q

If a pump happens to ingest fluid within trained air, the air bubbles will have somewhat the same effect on a pump as cavitation however because it’s not associated with liquids vapor pressure it is referred to as

A

Pseudo cavitation

23
Q

Hydraulic actuators convert

A

Hydraulic working energy into mechanical, working energy

24
Q

Hydraulic actuators can be divided into two times

A

Linear and rotary

25
Q

Full control valve is a resistance, which

A

Results in a higher pressure being applied by the pump

26
Q

If I were operated, check valve will only flow through the outlet to the inlet when

A

As long as sufficient, pilot pressure is acting on the plunger piston

27
Q

In cases of Hydro pneumatic, accumulators nitrogen is to be used and never should

A

Compressed air should never be used over oil

28
Q

Since church accumulators are a source of hydraulic potential energy, stored energy of an accumulator can be used

A

To develop system flow when system demand is greater than pump delivery

29
Q

For proper operation, a positive seal must exist across

A

A cylinders piston, as well as the rod gland

30
Q

To protect against excessive shock, a cylinder can be equipped with these to slow down a cylinder, pistons movement before reaching the end of its stroke, and can be applied at either end, or both ends of the cylinder

A

A cylinder cushion

31
Q

During retraction, when full pump flow is directed to the rod side of a single cylinder

A

A piston rod will retract faster than it extended

32
Q

If more precise metering is required, this type of control valve is used

A

A pressure compensated flow control valve makes allowances for pressure changes ahead, or after the orifice

33
Q

If control valve placed at the outlet, port of an actuator control controls, the rate of flow, exiting the actuator this is

A

This is a meter out circuit and gives positive speed control to actuators

34
Q

Three-way directional valve can be used to operate

A

Single, acting actuators, like rams and spring return cylinders

35
Q

A normally, non-passing pressure control valve, which causes one operation to occur before another is

A

Referred to as a sequence valve

36
Q

A normally, non-passing pressure control valve can be used to balance or counteract a weight, such as a Platen of a press

A

This valve is called a counterbalance valve

37
Q

A simple relief valve basically consist of a valve body with a spool, which is biased by a heavy spring it actuates by

A

When pilot pressure at the school and opposite to the spring is high enough, the school moves up opening a path to tank for pump flow

38
Q

A pressure reducing valve usually is a

A

Normally passing pressure reducing valve

39
Q

A pressure reducing valve operates by

A

Sensing fluid pressure after it has passed through the valve

40
Q

Two variations of a positive displacement pump are

A

Fixed displacement and variable displacement

41
Q

Out of the vein gear, and Pister motors which Are available as variable displacement, motors

A

Piston motors are available as variable displacement

42
Q

What does breakaway torque mean?

A

A demand of load it must satisfy before it will rotate

43
Q

Besides acting as a food container, a reservoir serves also to

A

Cool, the fluid, to allow calm contamination to settle out, and to allow in trained air to escape

44
Q

Out of the L-shaped reservoir, the the overhead reservoir, and the conventional reservoir, which is the most commonly used industrial hydraulic reservoir

A

The conventional reservoir

45
Q

Dirt was previously defined as any type of insoluble material in a hydraulic fluid the sources by which enters the system is

A

Built into a system, generated within a system, and added to a system

46
Q

If not size correctly, improperly, maintain, this may starve the sump pump

A

Sump strainer

47
Q

Positioned in the circuit between the pump and a system component

A

Pressure filter

Hydraulics (1 decks)

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